Here is a quick video of my 4 wheel drive allisgator. In the first part of the video I shift the second rear end in reverse and the front tranny in forward. You can see the rear tires spin backwards as the tractor is going forward. When it is going up the ramps to the trailer you can see how the second rear end moves up and down. I'm just getting this video thingy figured out. Hope to get you better videos as time goes on.